The performance, phytotoxicity and persistence of three petroleum oils for control of the pear psylla

Authors

  • Harold F. Madsen Research Station Research Branch Canada Department of Agriculture Summerland, B.C.
  • K. Williams Research Station Research Branch Canada Department of Agriculture Summerland, B.C.

Keywords:

pear psylla

Abstract

Good control of the pear psylla, <i>Psylla pyricola</i> Foerster, was obtained with two of three petroleum oils tested under field conditions. Each oil was applied three times during the season, once in the delayed dormant stage and twice in the summer. Oil B (vis. 145 S.S.U. ) and Cil C (vis. 70 S.S.U.) provided seasonal control. Oil A (vis. 71.7 S.S.U.) did not give satisfactory control because of poor kill of pear psylla adults. All three oils caused enlargement and suberization of the bark lenticels on Bartlett pear trees. There was no significant injury to foliage. Oil-treated fruit was equal in quality to fruit from a standard treatment. The three oils persisted upon fo liage for more than 35 days after treatment. Oils A and B showed no loss from the initi al deposit. Oil C had a higher initial deposit but this deposit declined 36 per cent after 8 days.

References

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Published

2019-08-26

Issue

Vol. 64 (1967): Journal of the Entomological Society of British Columbia

Section

Articles

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